twig
v.to suddenly understand something that was confusing or hidden. You use this when you finally 'get' a joke or a secret.
v.to perceive or understand the meaning of something, typically after a period of confusion. Often used in British English to describe a sudden moment of realization.
“He didn't twig that I was joking at first.”
“It took her a few minutes to twig that they were actually talking about her surprise party.”
“The detective watched the suspect's face closely, waiting for the moment he would finally twig that the police had found the hidden evidence.”
The verb is often used with 'that' or 'to' ('twigged to the fact').
While it can be used with a direct object, it is much more common to follow 'twig' with a 'that' clause or 'to'.
PIE word *dwóh₁ From Middle English twig, twyg, twigge, twygge, from Old English twigg, twicg, from Proto-West Germanic twiggu (“small twig, shoot”), apparently a diminutive of Proto-West Germanic twig (“branch, twig”) (whence also Old English twiġ and twiġa), from Proto-Germanic twīgą, from Proto-Indo-European dweygʰom, from *dwóh₁. More at two. Cognates Cognate with North Frisian twiich, twiig (“twig”), Saterland Frisian Twiech (“branch, twig”), West Frisian twiich (“twig”), Dutch twijg (“twig”), German Zweig (“branch, twig; section”), German Low German Twieg (“branch, twig”), Luxembourgish Zwäig (“twig”), Yiddish צווײַג (tsvayg, “branch”); also Old Church Slavonic двигъ (dvigŭ, “branch”), Albanian degë (“branch”).
From Irish and Scottish Gaelic tuig (“to understand”).
Compare tweak.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.